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/*=========================================================================
*
* Copyright UMC Utrecht and contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef itkImageFileCastWriter_h
#define itkImageFileCastWriter_h
#include "itkImageFileWriter.h"
#include "itkImageIOBase.h"
#include "itkMacro.h"
#include "itkSize.h"
#include "itkImageIORegion.h"
#include "itkCastImageFilter.h"
#include "elxDefaultConstruct.h"
namespace itk
{
/** \class ImageFileCastWriter
* \brief Casts pixel type and writes image data.
*
* This filter saves an image and casts the data on the fly,
* if necessary. This is useful in some cases, to avoid the use of
* a itk::CastImageFilter (to save memory for example).
*
*/
template <class TInputImage>
class ITK_TEMPLATE_EXPORT ImageFileCastWriter : public ImageFileWriter<TInputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(ImageFileCastWriter);
/** Standard class typedefs. */
using Self = ImageFileCastWriter;
using Superclass = ImageFileWriter<TInputImage>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(ImageFileCastWriter, ImageFileWriter);
/** Some convenient typedefs. */
using typename Superclass::InputImageType;
using typename Superclass::InputImagePointer;
using typename Superclass::InputImageRegionType;
using typename Superclass::InputImagePixelType;
itkStaticConstMacro(InputImageDimension, unsigned int, InputImageType::ImageDimension);
/** Set the component type for writing to disk; default: the same as
* the InputImagePixelType::ComponentType. This setting is ignored when
* the inputImagePixelType is not a scalar*/
itkSetStringMacro(OutputComponentType);
itkGetStringMacro(OutputComponentType);
protected:
ImageFileCastWriter() = default;
~ImageFileCastWriter() override = default;
/** Does the real work. */
void
GenerateData() override;
private:
/** Determine the default outputcomponentType */
static std::string
GetDefaultOutputComponentType();
/** Templated function that casts the input image and returns a
* a pointer to the PixelBuffer. Assumes scalar singlecomponent images
* The buffer data is valid until this->m_Caster is destroyed or assigned
* a new caster. The ImageIO's PixelType is also adapted by this function */
template <class OutputComponentType>
void *
ConvertScalarImage(const DataObject * inputImage)
{
using DiskImageType = Image<OutputComponentType, InputImageDimension>;
using InputImageComponentType = typename PixelTraits<InputImagePixelType>::ValueType;
using ScalarInputImageType = Image<InputImageComponentType, InputImageDimension>;
/** Reconfigure the imageIO */
this->GetModifiableImageIO()->SetPixelTypeInfo(static_cast<const OutputComponentType *>(nullptr));
/** cast the input image */
const auto caster = CastImageFilter<ScalarInputImageType, DiskImageType>::New();
this->m_Caster = caster;
const auto localInputImage = ScalarInputImageType::New();
localInputImage->Graft(static_cast<const ScalarInputImageType *>(inputImage));
caster->SetInput(localInputImage);
caster->Update();
/** return the pixel buffer of the casted image */
return caster->GetOutput()->GetBufferPointer();
}
ProcessObject::Pointer m_Caster{ nullptr };
std::string m_OutputComponentType{ Self::GetDefaultOutputComponentType() };
};
/** Convenience function for writing a casted image. */
template <typename TImage>
void
WriteCastedImage(const TImage & image,
const std::string & filename,
const std::string & outputComponentType,
bool compress)
{
elx::DefaultConstruct<ImageFileCastWriter<TImage>> writer;
writer.SetInput(&image);
writer.SetFileName(filename);
writer.SetOutputComponentType(outputComponentType);
writer.SetUseCompression(compress);
writer.Update();
}
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkImageFileCastWriter.hxx"
#endif
#endif // itkImageFileCastWriter_h
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